Experimental and simulation study on the aerodynamic performance of a counter rotating vertical axis wind turbine

The Darrieus H-rotor has gained much interest in the last few decades as among the reliable devices for wind energy conversion techniques, for their relatively simple structure and aerodynamic performance. In the present work, development and aerodynamic performance predictions of a unique contra-ro...

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Main Author:	Didane, Djamal Hissein
Format:	Thesis
Language:	English English
Published:	2017
Subjects:	TJ266-267.5 Turbines Turbomachines (General) TJ807-830 Renewable energy sources
Online Access:	http://eprints.uthm.edu.my/316/1/24p%20DJAMAL%20HISSEIN%20DIDANE.pdf http://eprints.uthm.edu.my/316/2/DJAMAL%20HISSEIN%20DIDANE%20WATERMARK.pdf
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id	my-uthm-ep.316
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spelling	my-uthm-ep.3162021-07-21T04:25:46Z Experimental and simulation study on the aerodynamic performance of a counter rotating vertical axis wind turbine 2017-11 Didane, Djamal Hissein TJ266-267.5 Turbines. Turbomachines (General) TJ807-830 Renewable energy sources The Darrieus H-rotor has gained much interest in the last few decades as among the reliable devices for wind energy conversion techniques, for their relatively simple structure and aerodynamic performance. In the present work, development and aerodynamic performance predictions of a unique contra-rotating VAWT have been studied through experimental and computational approaches as it has yet to be applied to a VAWT. The main purpose of this study is to develop and investigate the practicality of employing the contra-rotating concept to a VAWT system while enhancing its conversion efficiency. The simulation study was performed using three-dimensional computational fluid dynamics (CFD) models based on K-omega shear stress transport (SST) model. The computational work covers a wider range of simulation processes compared to the experiment which includes a parametric study based on the axial distance between the two rotors and blade height. The performance evaluations of the current models were established in terms of key aerodynamic parameters such as torque and power. The systematic analysis of these quantities showed the usefulness of the contra-rotating technique on a VAWT system and the ability to extract additional more than threefold power over the entire operating wind speeds covered. The system has also improved the inherent difficulties of the Darrieus rotor to self-start. The results also demonstrated a significant increase in terms of conversion efficiency for both power and torque compared to a single-rotor system of a similar type. A maximum of 43% and 46% of power and torque coefficients were respectively possible with the current dual-rotor system. The simulation results indicate that smaller axial distance tends to enhance the performance output of the system relatively better compared to a larger distance. However, in terms of the blade height, longer blades generated the highest amount of power. It is anticipated that this current technique could revolutionize wind energy harvesting strategies and would find applications in a wide range of sites that are characterized by low and moderate wind regimes and particularly be useful in the urban environment where turbulence is high. 2017-11 Thesis http://eprints.uthm.edu.my/316/ http://eprints.uthm.edu.my/316/1/24p%20DJAMAL%20HISSEIN%20DIDANE.pdf text en public http://eprints.uthm.edu.my/316/2/DJAMAL%20HISSEIN%20DIDANE%20WATERMARK.pdf text en validuser phd doctoral Universiti Tun Hussein Onn Malaysia Fakulti Kejuruteraan Mekanikal dan Pembuatan
institution	Universiti Tun Hussein Onn Malaysia
collection	UTHM Institutional Repository
language	English English
topic	TJ266-267.5 Turbines Turbomachines (General) TJ807-830 Renewable energy sources
spellingShingle	TJ266-267.5 Turbines Turbomachines (General) TJ807-830 Renewable energy sources Didane, Djamal Hissein Experimental and simulation study on the aerodynamic performance of a counter rotating vertical axis wind turbine
description	The Darrieus H-rotor has gained much interest in the last few decades as among the reliable devices for wind energy conversion techniques, for their relatively simple structure and aerodynamic performance. In the present work, development and aerodynamic performance predictions of a unique contra-rotating VAWT have been studied through experimental and computational approaches as it has yet to be applied to a VAWT. The main purpose of this study is to develop and investigate the practicality of employing the contra-rotating concept to a VAWT system while enhancing its conversion efficiency. The simulation study was performed using three-dimensional computational fluid dynamics (CFD) models based on K-omega shear stress transport (SST) model. The computational work covers a wider range of simulation processes compared to the experiment which includes a parametric study based on the axial distance between the two rotors and blade height. The performance evaluations of the current models were established in terms of key aerodynamic parameters such as torque and power. The systematic analysis of these quantities showed the usefulness of the contra-rotating technique on a VAWT system and the ability to extract additional more than threefold power over the entire operating wind speeds covered. The system has also improved the inherent difficulties of the Darrieus rotor to self-start. The results also demonstrated a significant increase in terms of conversion efficiency for both power and torque compared to a single-rotor system of a similar type. A maximum of 43% and 46% of power and torque coefficients were respectively possible with the current dual-rotor system. The simulation results indicate that smaller axial distance tends to enhance the performance output of the system relatively better compared to a larger distance. However, in terms of the blade height, longer blades generated the highest amount of power. It is anticipated that this current technique could revolutionize wind energy harvesting strategies and would find applications in a wide range of sites that are characterized by low and moderate wind regimes and particularly be useful in the urban environment where turbulence is high.
format	Thesis
qualification_name	Doctor of Philosophy (PhD.)
qualification_level	Doctorate
author	Didane, Djamal Hissein
author_facet	Didane, Djamal Hissein
author_sort	Didane, Djamal Hissein
title	Experimental and simulation study on the aerodynamic performance of a counter rotating vertical axis wind turbine
title_short	Experimental and simulation study on the aerodynamic performance of a counter rotating vertical axis wind turbine
title_full	Experimental and simulation study on the aerodynamic performance of a counter rotating vertical axis wind turbine
title_fullStr	Experimental and simulation study on the aerodynamic performance of a counter rotating vertical axis wind turbine
title_full_unstemmed	Experimental and simulation study on the aerodynamic performance of a counter rotating vertical axis wind turbine
title_sort	experimental and simulation study on the aerodynamic performance of a counter rotating vertical axis wind turbine
granting_institution	Universiti Tun Hussein Onn Malaysia
granting_department	Fakulti Kejuruteraan Mekanikal dan Pembuatan
publishDate	2017
url	http://eprints.uthm.edu.my/316/1/24p%20DJAMAL%20HISSEIN%20DIDANE.pdf http://eprints.uthm.edu.my/316/2/DJAMAL%20HISSEIN%20DIDANE%20WATERMARK.pdf
_version_	1747830580583596032

Experimental and simulation study on the aerodynamic performance of a counter rotating vertical axis wind turbine

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